期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 24, 页码 8767-8774出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061959
关键词
anthropogenic stresses; induced seismicity; stress triggering; surface subsidence; geothermal energy; fluid extraction
资金
- National Science Foundation Graduate Research Fellowship Program (NSFGRFP) [2014176918]
- NSF EarthScope program [EAR-1147427]
- Southern California Earthquake (SCEC) grant [14031]
The M-w 7.2 El Mayor-Cucapah (EMC) earthquake ruptured a complex fault system in northern Baja California that was previously considered inactive. The Cerro Prieto Geothermal Field (CPGF), site of the world's second largest geothermal power plant, is located approximately 15km to the northeast of the EMC hypocenter. We investigate whether anthropogenic fluid extraction at the CPGF caused a significant perturbation to the stress field in the EMC rupture zone. We use Advanced Land Observing Satellite interferometric synthetic aperture radar data to develop a laterally heterogeneous model of fluid extraction at the CPGF and estimate that this extraction generates positive Coulomb stressing rates of order 15 kPa/yr near the EMC hypocenter, a value which exceeds the local tectonic stressing rate. Although we cannot definitively conclude that production at the CPGF triggered the EMC earthquake, its influence on the local stress field is substantial and should not be neglected in local seismic hazard assessments.
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